The usual way to get to The Gardens House is via C850 - the Binalong Bay Rd - and turn off on The Gardens Rd (C848). Recently, the higher than usual rainfall caused some substantial flooding in the low lying area of the Binalong Bay Rd, roughly where the A - B line is on the above map.
This is not a major problem, as there are shops at Binalong Bay for basic food supplies, not to mention the Angasi restaurant!
There is also the alternative of Reid's Rd (C849) which takes you back through the hills to Priory. This is a fairly good, but unsealed road, so a modicum of care is necessary when driving. It does avoid all the low lying areas which tend to get flooded and is a good alternative in these circumstances!